全球智库信息集成服务系统(G2TT): Interspecific competition between stream-dwelling brown trout and Alpine bullhead.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1046/j.1095-8649.2003.00112.x
	Interspecific competition between stream-dwelling brown trout and Alpine bullhead.
	Holmen J; Olsen EM; Voellestad LA
发表日期	2003
出处	Journal of Fish Biology 62 (6): 1312-1325
出版年	2003
语种	英语
摘要	Density and composition of benthic invertebrates and the diet of brown trout Salmo trutta and Alpine bullhead Cottus poecilopus were studied at two sites in one Norwegian stream. The sites were separated by an impassable waterfall, and brown trout density was five to 10 times higher at the upper, allopatric site than downstream where it lived in sympatry with the Alpine bullhead. Benthic invertebrate communities did not differ between sites; however, the size distribution of chironomids and trichopterans were skewed towards lighter individuals at the sympatric site. Diet composition suggested that sympatric brown trout foraged more on invertebrate drift and from the surface than allopatric brown trout. Alpine bullhead diet did not differ significantly from brown trout diet, except that the Alpine bullhead fed on heavier individual prey within a few taxa and did not consume chironomid pupae or surface insects. The collected data support the hypothesis that brown trout living in sympatry with Alpine bullhead feed at locations with higher predation risk, which is a probable explanation for their lower population density.
主题	Adaptive Dynamics Network (ADN)
关键词	Allopatry Alpine bullhead Brown trout Competition diet Sympatry
URL	http://pure.iiasa.ac.at/id/eprint/6819/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/128214
推荐引用方式 GB/T 7714	Holmen J,Olsen EM,Voellestad LA. Interspecific competition between stream-dwelling brown trout and Alpine bullhead.. 2003.